It has been a busy few days for Hillary, as her daughter gave birth to baby Aidan Saturday. Hillary, husband Bill Clinton and Chelsea's husband Marc Mezvinsky all gathered at the hospital where they spent Father's Day doting on the newborn. Chelsea shared the first photos of Charlotte's little brother while still in the hospital.

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"At 7:41 AM Saturday, our family and hearts expanded with Aidan's arrival," Chelsea shared on Twitter while holding her baby. "We are blessed."

The former Secretary of State also tweeted her well wishes. "What a joy being with our new grandson, Aidan," she shared on Twitter Sunday afternoon. "So grateful. -H"

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Chelsea previously opened up to E! News' Maria Menounous about all things motherhood and shared that she has come a long way since giving birth to her first child, Charlotte. "I figured it out, but it took a while to figure it out," she said of learning to balance work and family. "It also just took lots of, like...it's swallowing my pride and being comfortable with pumping in airport bathrooms and kind of wherever I needed to get it done."